Improvement in hot-air furnaces



A. J. ROBINSON. HOT-AIR FURNACE.

No. 193,553. Patented July 24,1877.

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MPUERS, PHDTO-LITHOGRAPHER, WASHINGTON D C UNITED STATES T r'r'ro ANDREWJ. ROBINSON, OF TROY, NEW YORK.

IMPROVEMENTJN HOT- AiR. FURNACES- Specification forming part of LettersPatent No. 193,553, dated July 24,1877 application filed May 16,1877.

To all whom it may concern:

' Be itv known that I, ANDREW J. ROBINSON, of Troy, in the county ofRensselaer and State of New York, have invented certain new and usefulImprovements in Hot-Air Furnaces; and I do hereby declare that thefollowing is a full, clear, and exact description thereof, which willenable others skilled in the art to which it appertains to make and usethe same, reference being had to the accompanying drawings, and to theletters of reference marked thereon, which form a part of thisspecification.

The nature of my invention relates to hotair furnaces; and it consistsin the construction and combination of parts, as will be hereinaftermore fully set forth.

In the annexed drawings, Figure l is a central vertical section on lineat m, Fig. 2. Fig. 2 is a transverse section on line y y, Fig. l; andFig. 3 is a bottom view, with the-bottom plate removed.

A represents the bottom plate of a stove or furnace, provided withsuitable openings on either side to receive the base of the heater B.This heater B (of which there may be any number) is provided with twoopenings for the admission of cold air, and one for the exit of the airafter it has been heated. It is also provided at the bottom and top withprojecting flanges b, adapted to be bolted fast, or otherwise secured tothe top and bottom plates of the stove or furnace. The heaters may be ofany desired shape, and may be so arranged that the cold air can beadmitted through the side walls of the heater instead of through thebottom, or the hot air may be taken out through the side walls insteadof the manner now shown. 0 is the top plate, provided with flanges oredges turned down, and fitting loosely in a groove, 0. This groove willbe filled with sand to secure a tight joint, and also to allow theheater B to expand and contract, and the top plate to rise and fall inthe dry sand without injury to any part of the heater or stove. D is aplate, which is placed on a line with the top of the fire-pot E, and isprovided with a collar, F, adapted to receive the smoke-pipe d, whichissues from one end of the furnace or stove, as shown in Figs. 1 and 3.The edges of this plate are turned up and supported by flanges 0 uponthe heater B. This plate may be made in one or more pieces, and coversthe whole of the space between the pipes of the heater. G is an ash-pit,which is placed under the bottom plate.

There may be a grate for thefire-pot and a door for the ash-pit, of anydesired construction.

The object of my invention is to heat air by passing it through separatepipes or heaters, having two or more openings for the admission of coldair, and one opening for the escape of hot air, so as to form anunbroken connection between the register where the hot air is deliveredand the cold air.

In stoves it is proposed to take cold air from a place other than thatin which the stove stands, so as not to take cold air from the room inwhich the stove is placed.

The advantages of this heater over others is, first, the absence ofjoints in the heater will not allow any gas to escape with the hot airin the rooms to be heated; second, by the unbroken connection betweenthe registers and cold air each pipe must deliver an equal case; and,third, any number of pipes can be heated by the same fire; and more thanone fire may be used-for instance, one in each end, for use in very coldweather.

I do not claim a sand packing, broadly, as

such a packing has been heretofore used in a groove formed by convergingorV-shaped lines; but by this arrangement the v contraction andexpansion of the plate, and the joining, all tend to work the sand tothe bottom, and lift the plate, and thereby prove injurious rather thanbeneficial, while by having a right-angled groove and tongue, or withequal width at the top and bottom, the movements of the metal do notwork the sand to the bottom of the groove.

Having thus fully described the invention, what is claimed as new, anddesired to be secured by Letters Patent, is-

1. In a furnace or stove the heater B, provided with flanges b, incombination with the ing equal width at its top and bottom, with thecorresponding tongue of the plate (3, and a sand filling or packing,substantially as and for the purpose set forth.

In testimony that I claim the foregoing as my own I have hereuntoaffixed my signature in presence of two witnesses.

ANDREW J. ROBINSON.

Witnesses: p J. B. SINSABAUGH, J H. REILAY.

